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I have a 92 LT1 Automatic. Cranking but won't start. I have had a problem with stumbling when stopping at light or I guess under load. Plus, oil leaks. I brought it to my mechanic, and he started diagnosing the problem. Oil leaking onto Optispark from Intake Manifold. Could be causing stumble...

Hello, Glad to be aboard. Have a couple of issues on my 92 C4. 1. Car has a jumpy idle at a stop light or any stop. Runs smooth on highway but around town when I stop it will idle fine then hiccup or stumble seems like it might stall but doesn't. 2. When I go over a bump and apply brakes I...